Think you can escape the world's troubles by heading to the multiplex this summer?

Think again.

Terrorist schemes have a starring role in the season's action movies, triggering an assortment of mayhem — collapsing skyscrapers, spaceships flying into densely populated cities and bombers run amok.

"Star Trek Into Darkness" features two attacks on crowded offices. The apparent villain in "Iron Man 3" bears a preternatural resemblance to Osama bin Laden. The survivors of collapsing high-rises in "Man of Steel" look just like New Yorkers covered in the gray ashes of the fallen World Trade Center towers. Critics have pointed out several terror analogies in the zombie drama "World War Z."

Coming out Friday, "White House Down" follows a violent Washington takeover in which the U.S. Capitol is blown up and the head of Homeland Security taken hostage by domestic fanatics. And in Aug. 28's conspiracy thriller "Closed Circuit," a bomb placed by a Muslim cell is detonated in a British market, prompting memorials similar to those after 9/11.

Twelve years after the Sept. 11 attacks made such plots commercially unthinkable, Hollywood is no longer shying away from story lines involving terrorists bent on harming civilians and destroying landmarks. Filmmakers say the trend reflects their attempt to give fantasy films some real-world relevance. And now, with the terror attacks more than a decade in the past, they say they no longer have to worry about alienating audiences.

"The way I process things is that I write about them, and you write about the times you live in," said James Vanderbilt, the screenwriter of "White House Down," which stars Channing Tatum as an aspiring Secret Service officer trying to rescue his daughter and the president when the White House is taken over by domestic terrorists.

"I was always fascinated with the idea of how you could take over the country — who would be able to do that," said Vanderbilt, who previously developed (but was unable to make) a movie based on Richard Clarke's memoir "Against All Enemies: Inside America's War on Terror."

The crop of movies represents a 180-degree turn from the immediate wake of the Sept. 11 attacks, when the film business put a freeze on movies that had the vaguest connection to terrorism and even shelved projects that had negative depictions of emergency personnel.

Some movies considered too topical — like Arnold Schwarzenegger's "Collateral Damage," about a terrorist bombing of a Los Angeles skyscraper, and Tim Allen's comedy "Big Trouble," which included a nuclear bomb on an airplane — were released months later than planned, and advertising images, including a "Spider-Man" image using the World Trade Center, were pulled.

Just as Hollywood didn't start examining the Vietnam War in depth until several years after the fall of Saigon — with movies such as "Platoon" and "Coming Home" — it's taken an equal amount of time for Hollywood to feel comfortable addressing terrorism. The industry's self-imposed suppression didn't vanish overnight. Rather, the change was gradual, starting several years ago with films about Middle East conflict.

"People have very short memories, and what was verboten 10 years ago no longer is today," said Michael Taylor, a veteran movie producer and the chair of film and television production at USC's School of Cinematic Arts. "Hollywood will always use what's in the zeitgeist to entertain people, and terror is in the zeitgeist."

"Iron Man 3" is the year's biggest blockbuster, with a worldwide gross in excess of $1.2 billion. The latest "Star Trek" sequel has sold more than $400 million in global tickets, and the new Superman movie, "Man of Steel" opened June 14 and has surpassed $400 million worldwide.

"Man of Steel" has perhaps the starkest visual ties to the 9/11 attacks, with its images of countless metropolitan buildings tumbling down, coating the people and streets below in ghostly residue.

Director Zack Snyder said he was trying to evoke one of America's darkest days in a mythological rather than literal sense, using Superman as something like a therapist.

"They're helping us understand the weird psychological and big horrible events that happen all the time. These guys deal with them in a dream-like way that makes it OK," the filmmaker said. "A modern problem — a city getting destroyed — a superhero can help you understand that."

In the latest "Star Trek" sequel, the action may unfold in the future but its terror elements — including a spaceship taking out a major city — are intended to remind audiences of the present.

"The film is about earthbound terror," said Chris Pine, who plays Capt. Kirk. "It's about terrorism, about issues we as human beings in 2013 deal with every day, about the exploitation of fear to take advantage of a population, about physical violence and destruction but also psychological manipulation."

Shane Black, the director and co-writer of "Iron Man 3," said the character of the Mandarin, played by Ben Kingsley and filmed by Black as if he were in a video leaked to Al Jazeera, is intended to represent "the ultimate terrorist" — even if the character is ultimately a proxy for another criminal mastermind.

"He's one of these guys who's become a warrior-philosopher, who sees the game of terrorism as this grand philosophical construct and has probably gone a little insane and has probably been witness to in his time a great many atrocities over which he may have presided," Black said. "But now he's sociopathic but at the same time has this driving hatred for America which fuels his rhetoric with which he recruits these legions of followers."

While terrorism may work well as a plot device, USC's Taylor says he wishes filmmakers would go a little deeper — using their platforms to explore how the root causes of terrorism and its consequences might be addressed.

"Maybe there is a missed opportunity — where they can include an issue of positive social change in the narrative," said Taylor, who founded USC's Media Institute for Social Change. "What can we be doing about terrorism, and how do we feel about it?"

That audiences are flocking to these movies represents a turnaround from just a few years ago, when moviegoers showed little interest in watching films that referenced any real conflict.

Oliver Stone's "World Trade Center," the true tale of two first responders who survived the attack, was a modest commercial and critical success in 2006, but a slew of other recent movies about the Middle East largely fizzled, including "The Green Zone," "Stop-Loss," and "The Lucky Ones."

Director Kathryn Bigelow's "The Hurt Locker" won the 2009 best picture Oscar but grossed just $17 million in domestic release. Her "Zero Dark Thirty," about the killing of Bin Laden, was more popular last year, taking in more than $100 million globally.

Roland Emmerich, who directed "White House Down," balances the hostility of his radicals with comic moments. All the same, he didn't want to shy away from graphic scenes, including the downing of a jumbo jet filled with people and the shooting down of military helicopters.

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